Patent · US Expired

Method and apparatus for controlling the quantity of emitted light in an optical measuring head

US4934810A · kind A · utility

9Cited by

8References

11Claims

0Family size

Assignee

Carl Zeiss Stiftung · DE

Inventors

Ulrich Nagele · Heubach, DE
Horst Ballmer · Heidenheim, DE
Berndt Kammleiter · Oberkochen, DE
Klaus-Peter Koch · Aalen, DE

Key dates

Filing date	Dec 19, 1988
Grant date	Jun 19, 1990
Priority date	—
Expiry date	Dec 19, 2008

Classification

Technology area (CPC G)Physics
CPC primaryG01B11/007
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

The invention relates to a method and apparatus for controlling the quantity of emitted light in an optical measuring head. The control of the emitted light quantity of a laser diode mounted in the optical measuring head is dependent upon the stray light characteristics of the workpiece and is achieved by controlling the pulse width of the laser diode. The light pulses are synchronized with the machine clock frequency of the coordinate measuring apparatus on which the measuring head is fixedly mounted such that the center of the pulse coincides always with the counter strobe of the measuring system of the coordinate measuring apparatus.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.